Bruce,
Am using 250 gr Hornady XTP inside a Harvestor Crush-rib sabot in front of 90 gr 777 and a Remington Kleanbore primer in my Z5. Two deer died earlier this month with this load - one by my son and one that I shot. The Crush-rib sabot makes loading a bit easier. Still get a pretty bad crud ring so will be working on that for next year. (Will try different primers or am considering the Vari-flame route.) Good luck tomorrow!!
Bob